It could be possible to do 447/402 from a benzin version of the tri-turbo diesel design. I would more likely buy a 3.2 though because it has more potential. With those big of back tires I'm assuming higher compression w high boost so w a trick intake setup that improves flow modulation, I could foresee twin dual or twin triple scroll turbos as well. But with turbo lag that's where the third turbo comes in. Listening to the exhaust clips it sure seems like there is a lot flow at low rpms so not sure to compare it to n55 sound, triturbo diesel sound or if sounds similar to s63tu. It appears the cylinders have some room to bore outwards but reinforcing def w aluminum block.